Customizing "Run Third-Party Payment Register"

We have a requirement to add Person Number to existing output of seeded Run Third-Party Payment Register. Challenge is that we couldn't see the HCM Extract being run on this flow.

Based on the Flow Pattern, the report category is as below

select * from pay_report_categories where base_category_name='Third Party Payment Register'

Tried searching the Third Party Payment Register in Extract Definition but couldn't see any results.

Anyone know how to see the HCM Extract for this flow, or anyone successfully customized this seeded report?